/*
 * Copyright (C) 2007 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.amphiprion.gameengine3d.util;

import javax.microedition.khronos.opengles.GL10;

public class MatrixGrabber {
	public MatrixGrabber() {
		mModelView = new float[16];
		mProjection = new float[16];
	}

	/**
	 * Record the current modelView and projection matrix state. Has the side
	 * effect of setting the current matrix state to GL_MODELVIEW
	 * 
	 * @param gl
	 */
	public void getCurrentState(GL10 gl) {
		getCurrentProjection(gl);
		getCurrentModelView(gl);
	}

	/**
	 * Record the current modelView matrix state. Has the side effect of setting
	 * the current matrix state to GL_MODELVIEW
	 * 
	 * @param gl
	 */
	public void getCurrentModelView(GL10 gl) {
		getMatrix(gl, GL10.GL_MODELVIEW, mModelView);
	}

	/**
	 * Record the current projection matrix state. Has the side effect of
	 * setting the current matrix state to GL_PROJECTION
	 * 
	 * @param gl
	 */
	public void getCurrentProjection(GL10 gl) {
		getMatrix(gl, GL10.GL_PROJECTION, mProjection);
	}

	private void getMatrix(GL10 gl, int mode, float[] mat) {
		MatrixTrackingGL gl2 = (MatrixTrackingGL) gl;
		gl2.glMatrixMode(mode);
		gl2.getMatrix(mat, 0);
	}

	public float[] mModelView;
	public float[] mProjection;
}
